SRE MetricSet

As a SRE, I want to have the ability to filter metrics exposed from the Management Clusters.

Context:
RHOBS resources allocated to HCP are scarce. Currently, we push every single metric to the RHOBS instance.
However, in [https://issues.redhat.com/browse/OSD-13741|OSD-13741], we've identified a subset of metrics that are important to SRE.

The ability to only export those metrics to RHOBS will reduce significantly the cost of monitoring as well as increase our ability to scale RHOBS.